Process for dyeing wool with dyestuffs capable of being chromed



gublic, residing a 35 and fastness of dye are 45 fite oellul brown 23,

Patented Oct. 14, 1924:

IPAUL ONIYEBTZ, OF BEBLIN-WILMEB8DOBE ANY, ASSIGHORS BERLIN, G RMANY.

To all whom. it may concern:

Be it known that we, PAUL ONNnnTz and s, citizens of the German Reermany, and Berlin, Germany, our P. 0. addresses bein Dusseldorfelstrasse 72, Berlin-Wilmers orf, Germany, and Groben Ufer 4, Berlin So. 33, German have in- Im rove- Woo with hromed, of is a specification.

v for Dyein estufi's Ca able of being w 'ch the following By treating with omium compounds, particularly chromic acid, wool, as is own, becomes harder. This has a most detrimental effect in dyeing with dyestufis which require a treatment with chromic acld or other chromium compounds, more especially when a high proportion of t? chromate is necessary for completely fixing the dye orwhen, as m art-wool dyeing, a materia is used which has previously been chromated.

According to our invention in dyeing W wool the deterioration of the physical properties of the wool caused b c romium compounds may be prevented y adding sulfite pitch or a constituent of ose waste li uor, such as a salt of lignine sulphonic acid, a sugar, particularly a pentose or a hexose. Shade of color not afiected by the addition, but the wool retains its soft and l texture (feel) and good spinning property. Moreover sulfite cellulose waste even absorption'of the d e.

en proposed to use sulliquor in the operation of preliminary mordanting wool; the invention does not extend to this use of sulose liquor, but dye baths or after-treatment baths.

e following examples illustrate our invention:

1. The bath contains: 3% fast chrome cryst. sodium sulfate, 4% acetic acid of stre 3% sulfite cel- 1 lulose waste liquor of 28 gravity, these percentages being calculated at Berlin-Wihnersdorf, half 7 is brought to the boil in half is concerned with mg constituents of sulfite Baum specific m v 1,511,359 PATENT OFFICE.

on the weight of the goods. The wool is introduced at 0.; the bath is brou ht to the boil in half an hour and boiled or an hour. For exhausting the bath 1.5% of sulfuric acid is added and the whole boiled for another half an hour. on in the same bath there follows a treatment with 1.5% of the of potassium bichromate, a boiling for three quarters of an hour, and, finally, rinsing.

2. Into the bath. containing 3% metachrome brown B, 3% metachrome mordant, 2.5% sulfite cellulose waste liquor of 28 Baum specific gravit the rcenta s bein calculated on e weig t of t e s; the wool is introduced at 50 C. and he bath is brought slowl to the boil and boiled for 2 hours. For t e better fixation of the dyestufis 1% of acetic acid of 30% stren h is further added and boile for another half an hour.

3. The bath is prepared with 2% anthra cene chromate blue XR, 1% potassium bichromate, 3% magnesium sulfate, 2% sulfite cellulose waste liquor of 28 Baum specific gravity, ,the gercen" s being calculated on the weig t of e goods; the wool is introduced at 70 (1, the bath an hour and boiled for one hour; 1-2% of acetic acid of 30% strength is 'slowl added and the whole boiled or another half an hour.

Having now particularly described our invention and in what manner it may be performed what we claim is,-

1. In process of dyeing wool in which a chromium compound is added to the bath protecting the wool action-of the chromium compoundby adding sulfite cellulose waste liquor to the bath containing the chromium compound.

In process of dyeing wool in which a chromium compound is added to the bath, protecting the wool against the detrimental action of the chromium compound by addliquor to the bath compound.

3. In process of dyeing wool in which a chromium compound is added to the bath, protectin th wool against the detriromium compound by adding a salt of lignme sulfonic acid and containing the chromium the whole against the detrimental.

cellulose waste weight of the goods e sugar to the bath containing the chromium In testimony whereof we afiix our signe- 'compound, tures in presence of twowitnesses:

4. In process of dyeing wool in which a.

chromium compound is added to the bath, DR. 'PAUL ONNERTZ.

6 protecting the Wool. against the detrimental PETERS. action of the chromium compound by ad Witnesses: 7 Q

ing a. sugar to the bath containing the LEO KERROVIUS,

chromium compound. Dr. MAX BRAUNB, 

